title: [Three-dimensional finite element analysis of the upper cervical-defected incisor with labial access or lingual access].
abstract: OBJECTIVE
  To evaluate the stress distribution of the cervical-defected incisor with labial or lingual endodontic access with finite element analysis (FEA), and to explore the advantage of resistance in labial endodontic access.
  
  
  METHODS
  3-D finite element models of upper cervical-defected incisor were established using cone-beam CT (CBCT), Mimics Catia, and Ansys software. The subjects were categorized according to the two endodontic accesses and three restorative ways, which were composite resin, glass fiber-reinforced composite resin and glass fiber-reinforced post-crown. All the models were loaded.The von Mises stress values and distribution were recorded and analyzed with Ansys 10.0 software.
  
  
  RESULTS
  In this study, direct composite resin restoration showed no significant difference between the labial and lingual access. In glass fiber-reinforced composite resin, labial access could transfer the stress concentration area. It could reduce the incidence of fracture of the cervical lesion but increase the incidence of root fracture. Post-crown restoration could obviously reduce the incidence of fracture of the cervical lesion.
  
  
  CONCLUSIONS
  When the cervical-defected incisor is restored with composite resin, labial and lingual accesses can be considered. Labial access with glass fiber-reinforced composite resin or post-crown restoration is a good choice.
authors.affiliation: State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Sichuan University. Chengdu 610041, Sichuan Province, China.E-mail:levelsufan@163.com.
authors.forename: Fan
authors.initials: F
authors.lastname: Su
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Qin
authors.initials: Q
authors.lastname: Su
mesh_terms: D003188:Composite Resins; D003442:Crowns; D020342:Finite Element Analysis; D005898:Glass; D006801:Humans; D007180:Incisor; D011176:Post and Core Technique; D019228:Tooth Crown; D014092:Tooth Root; D019553:Tooth, Nonvital
chemical_list: D003188:Composite Resins; C009753:fiberglass